PHP byte conversion function
Generelly we need to display the file size in file sharing applications. Here we use below function to display the size in bytes with filesize function.
function byte_convert($bytes) { $symbol = array('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'); $exp = 0; $converted_value = 0; if( $bytes > 0 ) { $exp = floor( log($bytes)/log(1024) ); $converted_value = ( $bytes/pow(1024,floor($exp)) ); } return sprintf( '%.2f '.$symbol[$exp], $converted_value ); //we can't use PHP integer unsigned as some systems use 32 bit and other 64 bit ,so here we use C style function sprintf }
File size stadards
computer data and file size is normally measured in binary code using the binary number system, the prefixes for the multiples are based on the metric system! The nearest binary number to 1,000 is 2^10 or 1,024; thus 1,024 bytes was named a Kilobyte.
| New IEC Standard | ||
| bit | bit | 0 or 1 |
| byte | B | 8 bits |
| kibibit | Kibit | 1024 bits |
| kilobit | kbit | 1000 bits |
| kibibyte (binary) | KiB | 1024 bytes |
| kilobyte (decimal) | kB | 1000 bytes |
| megabit | Mbit | 1000 kilobits |
| mebibyte (binary) | MiB | 1024 kibibytes |
| megabyte (decimal) | MB | 1000 kilobytes |
| gigabit | Gbit | 1000 megabits |
| gibibyte (binary) | GiB | 1024 mebibytes |
| gigabyte (decimal) | GB | 1000 megabytes |
| terabit | Tbit | 1000 gigabits |
| tebibyte (binary) | TiB | 1024 gibibytes |
| terabyte (decimal) | TB | 1000 gigabytes |
| petabit | Pbit | 1000 terabits |
| pebibyte (binary) | PiB | 1024 tebibytes |
| petabyte (decimal) | PB | 1000 terabytes |
| exabit | Ebit | 1000 petabits |
| exbibyte (binary) | EiB | 1024 pebibytes |
| exabyte (decimal) | EB | 1000 petabytes |
